package com.nowcoder.community.controller;


import com.nowcoder.community.entity.Event;
import com.nowcoder.community.entity.Page;
import com.nowcoder.community.entity.User;
import com.nowcoder.community.event.EventProducer;
import com.nowcoder.community.service.FollowService;
import com.nowcoder.community.service.UserService;
import com.nowcoder.community.util.CommunityConstant;
import com.nowcoder.community.util.CommunityUtil;
import com.nowcoder.community.util.HostHolder;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Controller;
import org.springframework.ui.Model;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RequestMethod;
import org.springframework.web.bind.annotation.ResponseBody;

import java.util.List;
import java.util.Map;

@Controller
public class FollowController implements CommunityConstant {
    @Autowired
    private FollowService followService;

    @Autowired
    private HostHolder hostHolder;

    @Autowired
    private UserService userService;

    @Autowired
    private EventProducer eventProducer;

    // 关注 异步
    @RequestMapping(value = "/follow", method = RequestMethod.POST)
    @ResponseBody
    public String follow(int entityId, int entityType){
        User user = hostHolder.getUser();
        followService.follow(user.getId(), entityType, entityId);

        // 触发关注事件
        Event event = new Event()
                .setTopic(TOPIC_FOLLOW)
                .setUserId(user.getId())
                .setEntityType(entityType)
                .setEntityId(entityId)
                .setEntityUserId(entityId);
        eventProducer.fireEvent(event);


        return CommunityUtil.getJSONString(0, "已关注");
    }

    // 取消关注 异步
    @RequestMapping(value = "/unfollow", method = RequestMethod.POST)
    @ResponseBody
    public String unfollow(int entityId, int entityType){
        User user = hostHolder.getUser();
        followService.unfollow(user.getId(), entityType, entityId);

        return CommunityUtil.getJSONString(0, "取消关注");
    }

    // 查询某用户所关注的人
    @RequestMapping(value = "/followees/{userId}", method = RequestMethod.GET)
    public String getFollowees(@PathVariable int userId, Model model, Page page){
        User user = userService.findUserById(userId);
        if(user == null)
            throw new RuntimeException("该用户不存在");
        model.addAttribute("user", user);

        page.setLimit(5);
        page.setPath("/followees/" + userId);
        page.setRows((int)followService.findFolloweeCount(userId, ENTITY_TYPE_USER));

        List<Map<String, Object>> userList = followService.findFollowees(userId, page.getOffset(), page.getLimit());
        if(userList!=null){
            for(Map<String, Object> map : userList){
                User u = (User) map.get("user");
                map.put("hasFollowed", hasFollowed(u.getId()));
            }
        }

        model.addAttribute("users", userList);
        return "site/followee";

    }

    // 查询某用户的粉丝
    @RequestMapping(value = "/followers/{userId}", method = RequestMethod.GET)
    public String getFollowers(@PathVariable int userId, Model model, Page page){
        User user = userService.findUserById(userId);
        if(user == null)
            throw new RuntimeException("该用户不存在");
        model.addAttribute("user", user);

        page.setLimit(5);
        page.setPath("/followers/" + userId);
        page.setRows((int)followService.findFollowerCount(ENTITY_TYPE_USER, userId));

        List<Map<String, Object>> userList = followService.findFollowers(userId, page.getOffset(), page.getLimit());
        if(userList!=null){
            for(Map<String, Object> map : userList){
                User u = (User) map.get("user");
                map.put("hasFollowed", hasFollowed(u.getId()));
            }
        }

        model.addAttribute("users", userList);
        return "site/follower";

    }


    private boolean hasFollowed(int userId){
        if(hostHolder.getUser() == null)
            return false;
        return followService.hasFollowed(hostHolder.getUser().getId(), ENTITY_TYPE_USER, userId);
    }




}
